The control of sucker growth in tobacco by growth substances and mineral oils.

1953 ◽  
Vol 4 (4) ◽  
pp. 390
Author(s):  
J Calvert
Keyword(s):  
Growth Regulator ◽  
Indoleacetic Acid ◽  
Maleic Hydrazide ◽  
Growth Substances ◽  
Mineral Oils ◽  
Highly Effective

Indoleacetic acid ranging in concentration from 50 to 10,000 p.p.m. significantly reduced the growth of suckers on plants which had had the apical leaves and inflorescence excised. Five mineral oils significantly reduced the suckering in tobacco grown in the glass-house. Twelve mineral oils tested in north Queensland under conditions similar to commercial growing were all highly effective in reducing sucker growth. As the concentration of indoleacetic acid increased, the epinastic effect on the leaves became more pronounced. The mineral oils did not produce epinasty. No pathological reactions were observed with any of the treatments. Maleic hydrazide was the only growth regulator used in the field that significantly reduced sucker growth.

THE PHYSIOLOGY OF HOST–PARASITE RELATIONS: V. A PRELIMINARY EXAMINATION OF THE LEVEL OF FREE ENDOGENOUS INDOLEACETIC ACID IN RUSTED AND MILDEWED CEREAL LEAVES AND THEIR ABILITY TO DECARBOXYLATE EXOGENOUSLY SUPPLIED RADIOACTIVE INDOLEACETIC ACID

1958 ◽  
Vol 36 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Michael Shaw ◽  
A. R. Hawkins
Keyword(s):  
Oxidase Activity ◽  
Indoleacetic Acid ◽  
Sharp Decrease ◽  
Inhibiting Activity ◽  
Growth Substances ◽  
Fresh Weight ◽  
Avena Coleoptile ◽  
Preliminary Examination ◽  
Growth Promoting ◽  
Host Parasite

The growth substances were extracted with cold alcohol from the first leaves of uninfected, rusted (wheat), and mildewed (barley) cereal seedlings. The acid ether fractions were chromatographed on paper and the chromatograms were cut into sections which were assayed for growth promoting or inhibiting activity in the Avena coleoptile straight growth test. The estimated, free, endogenous indoleacetic acid content of uninfected leaves ranged from 0.5 to 3.2 μg. per kilogram fresh weight. In the early stages of infection this decreased, but increased again to from 5 to about 10 μg. per kilogram fresh weight by the 10th day after the inoculation of susceptible hosts. Indoleacetic acid was not detected in ungerminated uredospores of stem rust (race 15B), but two other growth promoting substances appeared to be present.Leaf disks were incubated with radioactive indoleacetic acid (as —C14OOK) and the radioactivity released as C14O2 was measured. The ability of the tissue to decarboxylate the indoleacetate (‘oxidase’ activity) increased sharply, sometimes to as much as 1000%, in the first 3 days after inoculation. With susceptible hosts, this increase was followed by an almost equally sharp decrease to less than 50% of the values for uninfected tissue. With infected, resistant tissue, the secondary decrease in ‘oxidase’ activity was delayed and less pronounced.The results are discussed and a working hypothesis suggested with respect to the relation between susceptibility or resistance and the auxin balance.

THE ENZYMICALLY CATALYZED OXIDATION OF INDOLEACETIC ACID

1956 ◽  
Vol 34 (6) ◽  
pp. 905-926 ◽  
Author(s):  
E. R. Waygood ◽  
Ann Oaks ◽  
G. A. Maclachlan
Keyword(s):  
Indoleacetic Acid ◽  
Maleic Hydrazide ◽  
Organic Peroxide ◽  
Horse Radish Peroxidase ◽  
Reaction Sequence ◽  
Leaf Extracts ◽  
Naturally Occurring ◽  
Wheat Leaf ◽  
Wheat Leaves ◽  
Catalyzed Oxidation

Dialyzed wheat leaf extracts, catalase, and horse-radish peroxidase catalyze the decarboxylation and oxidation of indoleacetic acid at pH 5.0–6.0 in the presence of critical concentrations of manganese and monohydric phenols or resorcinol. The equivalent of 1 mole of carbon dioxide is liberated and 1 mole of oxygen consumed per mole of substrate. Manganic ions formed by a phenol–peroxidase–peroxide system initiate the decarboxylation and oxidation. A naturally occurring ether soluble factor from wheat leaves, and maleic hydrazide, can substitute for the active phenols. Catechol, hydroquinone, pyrogallol, seopoletin, and riboflavin, etc. competitively inhibit the oxidation. The nature of the active peroxide is discussed and a reaction sequence involving an organic peroxide or radical rather than hydrogen peroxide is submitted as being a possibility.

Plant metabolic studies of the growth regulator maleic hydrazide

1995 ◽  
Vol 43 (10) ◽  
pp. 2713-2715 ◽  
Author(s):  
Dieter Komossa ◽  
Heinrich Jr. Sandermann
Keyword(s):  
Growth Regulator ◽  
Maleic Hydrazide ◽  
Metabolic Studies

SOME EFFECTS OF INDOLEACETIC ACID AND MALEIC HYDRAZIDE ON THE RESPIRATION AND FLOWERING OF WHEAT

1958 ◽  
Vol 36 (2) ◽  
pp. 233-237 ◽  
Author(s):  
M. Shaw ◽  
A. Oaks ◽  
D. J. Samborski
Keyword(s):  
Oxygen Consumption ◽  
Oxygen Uptake ◽  
Acid Content ◽  
Indoleacetic Acid ◽  
Maleic Hydrazide ◽  
Dry Weight ◽  
Sand Culture ◽  
Wheat Seedlings ◽  
Obligate Parasites ◽  
Leaf Disks

Wheat seedlings were grown in sand culture in 1 qt. crocks. Maleic hydrazide (10 mg. per crock per day) prevented flowering and increased the oxygen consumption per unit dry weight of the first leaves by 20 to 50%, but did not alter the C6/C1 ratio, which was measured by incubating leaf disks with glucose-6-C14 and glucose-1-C14. Indoleacetic acid (0.5 mg. per crock per day) increased oxygen uptake by only 10 to 15%, but stimulated flowering and apparently lowered the C6/C1 ratio. The C6/C1 ratio of leaf disks was approximately halved by 2 hours pretreatment with 5.0 and 8.3 p.p.m. of indoleacetic acid, mainly because of a decrease in the recovery of C6.The results are discussed briefly in relation to the effect of obligate parasites in increasing the indoleacetic acid content and in lowering the C6/C1 ratio of susceptible cereal leaves.

ChemInform Abstract: Synthesis of α-Trifluoromethylated Indoleacetic Acid (V): A Potential Peroxidase-Stable Plant Growth Regulator.

ChemInform ◽  
2010 ◽  
Vol 31 (1) ◽  
pp. no-no
Author(s):  
Katsuya Kato ◽  
Shozo Fujii ◽  
Yue-Fa Gong ◽  
Satoko Tanaka ◽  
Masato Katayama ◽  
...  
Keyword(s):  
Plant Growth ◽  
Growth Regulator ◽  
Plant Growth Regulator ◽  
Indoleacetic Acid

Synthesis of α-trifluoromethylated indoleacetic acid: a potential peroxidase-stable plant growth regulator

1999 ◽  
Vol 99 (1) ◽  
pp. 5-7 ◽  
Author(s):  
Katsuya Kato ◽  
Shozo Fujii ◽  
Yue-Fa Gong ◽  
Satoko Tanaka ◽  
Masato Katayama ◽  
...  
Keyword(s):  
Plant Growth ◽  
Growth Regulator ◽  
Plant Growth Regulator ◽  
Indoleacetic Acid
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